Headspace Solid-phase Microextraction and Gas Chromatography-Mass Spectrometry for the Rapid Detection of 5 Organophosphorus Pesticide Residues in Strawberries

A headspace solid-phase microextraction (HS-SPME) method in combination with GC-MS was developed for the rapid determination of diazinon, fenitrothion, fenthion, parathion ethyl and ethion in strawberries. The operating conditions of HS-SPME and GC-MS were optimized. A good linear relationship was found to each of the organophosphorus pesticides and the correlation coefficients were in the range of 0.989 - 0.998. The precision for determining the organophosphorus pesticides by this method (n = 5) varied from 7.2% to 12.7% and the limits of detection were 5.2-10.7 μg/kg. The spike recoveries ranged 76% - 94%. This method demonstrates many advantages including promptness, sensitivity, accuracy and low solvent con- sumption and therefore is able to meet the demand for determination of pesticide residues.